package com.zy.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.zy.reggie.common.R;
import com.zy.reggie.dto.DishDto;
import com.zy.reggie.entity.Category;
import com.zy.reggie.entity.Dish;
import com.zy.reggie.entity.DishFlavor;
import com.zy.reggie.service.CategoryService;
import com.zy.reggie.service.DishFlavorService;
import com.zy.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@Slf4j
@RestController
@RequestMapping("/dish")
public class DishController {
    @Autowired
    private DishService dishService;
    @Autowired
    private DishFlavorService dishFlavorService;
    @Autowired
    private CategoryService categoryService;
    @Autowired
    private RedisTemplate redisTemplate;
    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {
        log.info("dishDto是：{}",dishDto.toString());
        dishService.saveWithFlavor(dishDto);
        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);
        return R.success("新增菜品成功");
    }
    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name) {
        //分页构造器对象
        Page<Dish> pageInfo = new Page<Dish>(page,pageSize);
        //此时的dishDtoPage没有数据，因为数据库查询菜品信息时，获取到的分页查询结果 Page 的泛型为 Dish
        Page<DishDto> dishDtoPage = new Page<>();
        //创建查询构造器
        LambdaQueryWrapper<Dish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询过滤条件
        lambdaQueryWrapper.like(name != null,Dish::getName,name);
        //添加排序条件
        lambdaQueryWrapper.orderByDesc(Dish::getUpdateTime);
        //执行分页查询
        dishService.page(pageInfo,lambdaQueryWrapper);//此时categoryName不会显示在前端页面上，因为只有categoryId
        //所以不能单单使用dish这个对象，因为他不包含categoryName，所以使用dishDto
        //由于dishDtoPage没有数据，要把pageInfo中的数据赋值给它
        //赋值时忽略records这个集合，是要对此进行处理，此时records的泛型是dish,我们要使其变成dishDto
        BeanUtils.copyProperties(pageInfo,dishDtoPage,"records");
        List<Dish> records = pageInfo.getRecords();
        List<DishDto> list = records.stream().map((item) ->{
            //将记录赋值给dishDto
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);
            Long categoryId = item.getCategoryId();//获取分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category!=null){
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }
            return dishDto;

        }).collect(Collectors.toList());
        dishDtoPage.setRecords(list);
        return R.success(dishDtoPage);

    }

    /**
     * 根据id查询对应的菜品信息及口味信息；
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {
        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {
        log.info("dishDto是：{}",dishDto.toString());
        dishService.updateWithFlavor(dishDto);
        //清理某个分类下面的菜品缓存数据
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);
        return R.success("修改菜品成功");
    }

    /**
     * 根据条件查询对应菜品信息
     * @param dish
     * @return
     */
    @GetMapping("list")
    //使用形参dish来接受数据，功能更全面
    public R<List<DishDto>> list(Dish dish) {
        List<DishDto> dishDtoList = null;
        //先从缓存中去查询，若没有再去数据库查
        //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();
        //把数据存到此集合中
        dishDtoList  = (List<DishDto>) redisTemplate.opsForValue().get(key);
        if(dishDtoList != null){
            //如果存在，直接返回，无需查询数据库
            return R.success(dishDtoList);
        }

        //构造条件查询器
        LambdaQueryWrapper<Dish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(dish.getCategoryId()!=null,Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为1（起售状态）的菜品
        lambdaQueryWrapper.eq(Dish::getStatus,1);
        //排序
        lambdaQueryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);
        List<Dish> list = dishService.list(lambdaQueryWrapper);
        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if(category != null){
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrappers = new LambdaQueryWrapper<>();
            lambdaQueryWrappers.eq(DishFlavor::getDishId,dishId);
            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrappers);
            dishDto.setFlavors(dishFlavorList);

            return dishDto;
        }).collect(Collectors.toList());
        //如果不存在，需要查询数据库，将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key,dishDtoList,60, TimeUnit.MINUTES);

        return R.success(dishDtoList);
    }
}

